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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 811 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.252 + 68 =
  2. 2.319 + 57 =
  3. 3.284 + 99 =
  4. 4.338 + 27 =
  5. 5.224 + 47 =
  6. 6.303 + 48 =
  7. 7.227 + 67 =
  8. 8.400 + 29 =
  9. 9.412 + 87 =
  10. 10.316 + 99 =
  11. 11.205 + 99 =
  12. 12.174 + 37 =
  13. 13.282 + 58 =
  14. 14.490 + 99 =
  15. 15.254 + 89 =
  16. 16.63 + 47 =
  17. 17.113 + 28 =
  18. 18.476 + 99 =
  19. 19.72 + 68 =
  20. 20.336 + 77 =
  21. 21.328 + 89 =
  22. 22.334 + 27 =
  23. 23.282 + 88 =
  24. 24.476 + 37 =
  25. 25.160 + 18 =
  26. 26.361 + 27 =
  27. 27.317 + 29 =
  28. 28.319 + 18 =
  29. 29.52 + 78 =
  30. 30.132 + 38 =
  31. 31.368 + 17 =
  32. 32.212 + 68 =
  33. 33.38 + 67 =
  34. 34.236 + 37 =
  35. 35.372 + 39 =
  36. 36.82 + 98 =
  37. 37.117 + 97 =
  38. 38.372 + 48 =
  39. 39.93 + 27 =
  40. 40.281 + 89 =

Answer key

  1. 320
  2. 376
  3. 383
  4. 365
  5. 271
  6. 351
  7. 294
  8. 429
  9. 499
  10. 415
  11. 304
  12. 211
  13. 340
  14. 589
  15. 343
  16. 110
  17. 141
  18. 575
  19. 140
  20. 413
  21. 417
  22. 361
  23. 370
  24. 513
  25. 178
  26. 388
  27. 346
  28. 337
  29. 130
  30. 170
  31. 385
  32. 280
  33. 105
  34. 273
  35. 411
  36. 180
  37. 214
  38. 420
  39. 120
  40. 370

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